Thermal Design Method and Experimental Verification of Star Sensor System

doi:10.3901/JME.2021.22.325

Abstract

Abstract: Good dynamic performance is the key to capture the wind energy efficiently in the vertical axis wind turbine blades. Reasonable flow control method can effectively improve the aerodynamic performance of the blades and improve the utilization rate of wind energy. Based on the two-dimensional H-shaped vertical axis model, the effects of different ellipse airfoil slots and their opening width on the dynamic stall of vertical axis wind turbine are studied. The results show that the main mechanism of the slots is to delay the dynamic stall by controlling the flow separation. Compared with the baseline airfoil, the torque coefficient of the elliptic slot board airfoil increases by 53.8% when the tip speed ratio is 0.5, which significantly enhances the starting torque of the vertical axis wind turbine, however, when the tip speed ratio is greater than 1.5, the positive effect of the slots to control flow separation is not obvious. Compared with the traditional convergence straight airfoil slots, the elliptic airfoil slots have no significant influence on the outflow field due to the tangency between the fluid at the outlet and the surface of the airfoil, so the power coefficient of the elliptic airfoil slots is relatively higher when the tip ratio is larger. In addition, due to the reduction of the adverse pressure gradient on the suction surface, the phase angle of the stall of the blade is delayed by the elliptical airfoil slot, which effectively inhibits the flow separation and improves the operation stability of the wind turbine.

Key words: star sensor, target energy change, signal to noise ratio, thermal design, simulation analysis

CLC Number:

TG156

JI Songsong, SUN Ting, XING Fei. Thermal Design Method and Experimental Verification of Star Sensor System[J]. Journal of Mechanical Engineering, 2021, 57(22): 325-334.

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